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Modified carbon nanotubes as a sorbent for solid-phase extraction of gold, and its determination by graphite furnace atomic absorption spectrometry

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Abstract

A simple, sensitive and accurate method was developed for solid-phase extraction and preconcentration of trace levels of gold in various samples. It is based on the adsorption of gold on modified oxidized multi-walled carbon nanotubes prior to its determination by graphite furnace atomic absorption spectrometry. The type and volume of eluent solution, sample pH value, flow rates of sample and eluent, sorption capacity and breakthrough volume were optimized. Under these conditions, the method showed linearity in the range of 0.2–6.0 ng L−1 with coefficients of determination of >0.99 in the sample. The relative standard deviation for seven replicate determinations of gold (at a level of 0.6 ng L−1) is ±3.8 %, the detection limit is 31 pg L−1 (in the initial solution and at an S/N ratio of 3; for n = 8), and the enrichment factor is 200. The sorption capacity of the modified MWCNTs for gold(III) is 4.15 mg g−1. The procedure was successfully applied to the determination of gold in (spiked) water samples, human hair, human urine and standard reference material with recoveries ranging from 97.0 to 104.2 %.

A sorbent based on modified carbon nanotubes was prepared and used to extract gold ion from various samples prior to its determination by graphite furnace atomic absorption spectrometry

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Authors and Affiliations

  1. Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76169-133, Kerman, Iran

    Firouzeh Hassani Moghaddam, Mohammad Ali Taher, Mansoureh Behzadi & Matin Naghizadeh

  2. Young Researchers Society, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Kerman, Iran

    Firouzeh Hassani Moghaddam, Mansoureh Behzadi & Matin Naghizadeh

Authors
  1. Firouzeh Hassani Moghaddam
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  2. Mohammad Ali Taher
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  3. Mansoureh Behzadi
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  4. Matin Naghizadeh
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Correspondence to Mansoureh Behzadi.

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Moghaddam, F.H., Taher, M.A., Behzadi, M. et al. Modified carbon nanotubes as a sorbent for solid-phase extraction of gold, and its determination by graphite furnace atomic absorption spectrometry. Microchim Acta 182, 2123–2129 (2015). https://doi.org/10.1007/s00604-015-1550-4

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  • DOI: https://doi.org/10.1007/s00604-015-1550-4

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